653888861 has 2 divisors, whose sum is σ = 653888862. Its totient is φ = 653888860.

The previous prime is 653888803. The next prime is 653888887. The reversal of 653888861 is 168888356.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544288900 + 109599961 = 23330^2 + 10469^2 .

It is a cyclic number.

It is not a de Polignac number, because 653888861 - 2¹⁴ = 653872477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (653888801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326944430 + 326944431.

It is an arithmetic number, because the mean of its divisors is an integer number (326944431).

Almost surely, 2^653888861 is an apocalyptic number.

It is an amenable number.

653888861 is a deficient number, since it is larger than the sum of its proper divisors (1).

653888861 is an equidigital number, since it uses as much as digits as its factorization.

653888861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2211840, while the sum is 53.

The square root of 653888861 is about 25571.2506733636. The cubic root of 653888861 is about 867.9632015412.

The spelling of 653888861 in words is "six hundred fifty-three million, eight hundred eighty-eight thousand, eight hundred sixty-one".